#include <iostream>
#include <cmath>
using namespace std;

int main(){
	long double a, b, c;
	cout<<"Please input the lengthes of three sides (separ ated with space):";
	cin>>a>>b>>c;
	
	long double l;
	l = a;	
	if (l < b) l = b;
	if (l < c) l = c;
	
	long double k;
	k = a + b + c - l;
	if (k > l)
	cout<<"Yes."<<endl;
	else
	cout<<"No."<<endl;
}
